Common Gemstone Shapes and Cuts
A Gem or Gemstone – Is a mineral or organic material
with sufficient beauty, rarity and durability to be cut and set into
jewelry.
Antique Cushion Cut
It looks like a cross between a deep cut with large facets that was common in the late 19th and the early 20th centuries and a modern oval cut. This shape is also sometimes referred to as the “Pillow”. It has approximately 64 facets.
Baguette 
Is a rectangular narrow gem cut. It has approximately 20 facets. A tapered baguette is a trapezoid shape one end is narrower.
Is a pear shaped gemstone covered with facets that comes to a pointed end.
A rounded or curved (convex) outline and a smooth, polished surface with a flat
back. Usually for gemstones that are opaque, translucent, strongly colored or
have a star or cat's eye. The traditional cabochon is an oval but can also be
fashioned into other shapes including triangles, rectangles and round.
Emerald Cut
Is a rectangular or square step cut with diagonal corners. It has approximately
50 facets.
Heart Shape 
Is a pear shape with a cleft at the top. It has approximately 59 facets.
Is a symmetrical boat shaped brilliant cut gem with pointed ends. It has
approximately 57 facets.
Octagon Cut 
This is a “step” cut but with the four corners metered. The facets run in steps
parallel to the gemstone circumference. This cut is differentiated from the
Emerald cut by steps on the pavilion that are not equidistant. It has
approximately 53 facets.
Is a modified brilliant cut with an obround shaped girdle outline. The oval cut
has an elliptical shape when viewed from the top. It has approximately 69
facets.
Pear or Teardrop 
Asymmetrical cut with one pointed and one rounded end. A hybrid cut, combining
the best of the oval and the marquise, it is shaped like a sparkling teardrop.
It has approximately 71 facets.
Princess Cut
Is technically known as “Square Modified Brilliant” and is a
square version of
the round brilliant cut with numerous sparkling facets. It has approximately 76
facets.
Radiant
Is a rectangular cut, combining the shape of an emerald cut and sparkle of a
brilliant. It has approximately 70 facets.
Round Cut
As the name implies, it is round on top. It has approximately 57 facts.
Trillion 
Is a triangular shape. It has approximately 44 facets.
It is a special oblong shape where the sides are the same lengths. It
has approximately 57 facets.